TIA/EIA-862
TIA/EIA
STANDARD
ANSI/TIA/EIA-862-2002
Approved: April 11, 2002
Building Automation Systems Cabling
Standard for Commercial Buildings
TIA/EIA-862
APRIL 2002
TELECOMMUNICATIONS INDUSTRY ASSOCIATION
Representing the telecommunications industry in
association with the Electronic Industries Alliance
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(From Standards Proposal No. 3-4655-B, formulated under the cognizance of the TIA TR-42.1
Subcommittee on Commercial Building Telecommunication Cabling.)
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ANSI/TIA/EIA–862
Building Automation Systems Cabling Standard for
Commercial Buildings
Table of Contents
FOREWORD .........................................................................................................................................IV
1
INTRODUCTION............................................................................................................................. 1
1.1
1.2
1.3
1.4
1.5
2
SCOPE ............................................................................................................................................ 4
2.1
2.2
3
General..................................................................................................................................... 4
Normative references............................................................................................................... 4
DEFINITIONS, ACRONYMS & ABBREVIATIONS ........................................................................ 5
3.1
3.2
3.3
3.4
4
Purpose .................................................................................................................................... 1
Specification of criteria ............................................................................................................. 1
Metric equivalents of US customary units................................................................................ 1
Life of this Standard ................................................................................................................. 1
Telecommunications cabling system structure ........................................................................ 2
General..................................................................................................................................... 5
Definitions................................................................................................................................. 5
Acronyms and abbreviations.................................................................................................... 8
Units of measure ...................................................................................................................... 9
HORIZONTAL CABLING ............................................................................................................. 10
4.1
General................................................................................................................................... 10
4.2
Topology................................................................................................................................. 10
4.2.1 Centralized BAS ................................................................................................................. 11
4.3
Horizontal connection point (HCP)......................................................................................... 12
4.4
Building automation system outlet/connector ........................................................................ 13
4.5
Horizontal cross-connect........................................................................................................ 13
4.6
Recognized cabling components ........................................................................................... 13
4.6.1 Conductor gauge size......................................................................................................... 13
4.7
Horizontal distances............................................................................................................... 14
4.7.1 Distributed BAS horizontal cabling links............................................................................. 14
4.7.2 BAS channels ..................................................................................................................... 14
4.8
Cabling installation requirements........................................................................................... 14
4.8.1 Sharing pathways and spaces ........................................................................................... 14
4.8.2 Multiple applications ........................................................................................................... 15
4.8.3 Sheath sharing ................................................................................................................... 15
4.9
Grounding considerations ...................................................................................................... 15
5
BACKBONE CABLING ................................................................................................................ 16
5.1
General................................................................................................................................... 16
5.2
Topology................................................................................................................................. 16
5.2.1 Star topology ...................................................................................................................... 16
5.3
Recognized cables................................................................................................................. 16
5.3.1 Choosing media.................................................................................................................. 16
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ANSI/TIA/EIA-862
5.4
Backbone cabling distances .................................................................................................. 17
5.4.1 Intra and inter-building distances ....................................................................................... 17
5.4.2 Cabling directly between TRs or CTRs.............................................................................. 17
5.5
Cabling installation requirements .......................................................................................... 17
5.5.1 Sharing pathways and spaces ........................................................................................... 17
5.5.2 Multiple applications........................................................................................................... 17
5.5.3 Sheath sharing ................................................................................................................... 17
5.5.4 Grounding considerations .................................................................................................. 17
5.6
Redundancy........................................................................................................................... 17
6
COVERAGE AREA ...................................................................................................................... 18
6.1
General .................................................................................................................................. 18
6.2
Coverage area planning ........................................................................................................ 18
6.3
Coverage area cables............................................................................................................ 19
6.3.1 Connections to a BAS outlet/connector or HCP ................................................................ 19
6.3.2 Connections to and from BAS devices .............................................................................. 19
6.4
Coverage area topologies ..................................................................................................... 20
6.4.1 Physical device connections using a star topology............................................................ 20
6.5
Administration ........................................................................................................................ 22
6.6
Cabling installation requirements .......................................................................................... 22
6.6.1 Coverage area flexibility..................................................................................................... 22
7
TELECOMMUNICATIONS ROOMS ............................................................................................ 23
7.1
7.2
7.3
8
EQUIPMENT ROOMS .................................................................................................................. 24
8.1
8.2
9
General .................................................................................................................................. 23
Integration with voice/data/video systems ............................................................................. 23
Design.................................................................................................................................... 23
General .................................................................................................................................. 24
Design.................................................................................................................................... 24
ENTRANCE FACILITIES ............................................................................................................. 25
9.1
9.2
General .................................................................................................................................. 25
Design.................................................................................................................................... 25
10 TRANSMISSION AND FIELD TEST REQUIREMENTS.............................................................. 26
10.1
General .................................................................................................................................. 26
ANNEX A (NORMATIVE) POWER FEEDING BAS DEVICES OVER TWISTED-PAIR CABLING... 27
A.1
A.2
A.3
A.4
A.5
General .................................................................................................................................. 27
Current capacity..................................................................................................................... 27
Resistance and resistance unbalance................................................................................... 28
Operating voltage .................................................................................................................. 28
Power dissipation (load) ........................................................................................................ 29
ANNEX B (NORMATIVE) SEPARATION OF SERVICES.................................................................. 30
B.1
B.2
B.3
B.4
General .................................................................................................................................. 30
Life safety considerations ...................................................................................................... 30
Electrical safety considerations ............................................................................................. 30
Separation distances ............................................................................................................. 30
ANNEX C (NORMATIVE) OPTIONAL COVERAGE AREA TOPOLOGIES ...................................... 31
C.1 General .................................................................................................................................. 31
C.2 Multipoint bus and ring .......................................................................................................... 31
C.2.1 Multipoint bus ..................................................................................................................... 31
C.2.2 Multipoint ring..................................................................................................................... 32
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ANNEX D (INFORMATIVE) EXAMPLES OF LOW VOLTAGE BAS.................................................. 33
D.1
D.2
General................................................................................................................................... 33
Examples of BAS ................................................................................................................... 33
ANNEX E (INFORMATIVE) BALANCED MULTIPOINT DATA BUS ................................................. 34
E.1
E.2
E.3
E.4
E.5
E.6
E.7
General................................................................................................................................... 34
Data rate................................................................................................................................. 34
Topology................................................................................................................................. 34
Media selection ...................................................................................................................... 35
Horizontal distances............................................................................................................... 35
Termination ............................................................................................................................ 35
Node count ............................................................................................................................. 35
ANNEX F (INFORMATIVE) BIBLIOGRAPHY AND REFERENCES .................................................. 36
List of Figures
Figure 1: Example of BAS Cabling Structure in a single-tenant building ............................................... 3
Figure 2: Example of horizontal cabling using a star topology to coverage areas............................... 11
Figure 3: Example of distributed versus centralized BAS .................................................................... 12
Figure 4: Example of horizontal cabling link using an HCP ................................................................. 14
Figure 5: Example of horizontal cabling link using a BAS outlet/connector ......................................... 14
Figure 6: Example of a star topology.................................................................................................... 20
Figure 7: Example of bridge connection ............................................................................................... 21
Figure 8: Example of chain connection using two pairs per coverage area cable ............................... 21
Figure C-1: Example of a multipoint bus .............................................................................................. 31
Figure C-2: Example of a multipoint bus with optional bridge connections.......................................... 32
Figure C-3: Example of multipoint bus with optional BAS outlet/connector ......................................... 32
Figure C-4: Example of a multipoint ring .............................................................................................. 32
Figure E-1: Example of ANSI/TIA/EIA-485 system configuration ........................................................ 35
List of Tables
Table 1: Typical coverage area for each BAS link ............................................................................... 19
Table A-1: Maximum operating currents and temperatures for 24 AWG and 22 AWG cabling channels
............................................................................................................................................ 27
Table A-2: Maximum operating voltages for installed BAS cables in dry conditions ........................... 28
NOTE 2
Table A-3: Maximum operating voltages for installed BAS cables in wet conditions
................. 29
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FOREWORD
(This foreword is not considered part of this Standard.)
Approval of standard
This Standard was approved by TIA/EIA Subcommittee TR-42.1, TIA/EIA Engineering Committee
TR-42, and the American National Standards Institute (ANSI).
ANSI/TIA/EIA reviews standards every 5 years. At that time, standards are reaffirmed, rescinded, or
revised according to the submitted updates. Updates to be included in the next revision should be
sent to the committee chair or to ANSI/TIA/EIA.
Contributing organizations
More than 60 organizations within the telecommunications industry contributed their expertise to the
development of this Standard (including manufacturers, consultants, end users, and other
organizations).
The TR-42 Engineering Committee on User Premises Telecommunications Infrastructure contains
the following subcommittees related to this activity.
•
TR-42.1 - Subcommittee on Commercial Building Telecommunications Cabling
•
TR-42.2 - Subcommittee on Residential Telecommunications Infrastructure
•
TR-42.3 - Subcommittee on Commercial Building Telecommunications Pathways and Spaces
•
TR-42.4 - Subcommittee on Outside Plant Telecommunications Infrastructure
•
TR-42.5 - Subcommittee on Telecommunications Infrastructure Terms and Symbols
•
TR-42.6 - Subcommittee on Telecommunications Infrastructure and Equipment Administration
•
TR-42.7 - Subcommittee on Telecommunications Copper Cabling Systems
•
TR-42.8 - Subcommittee on Telecommunications Optical Fiber Cabling Systems
•
TR-42.9 - Subcommittee on Industrial Telecommunications Infrastructure
Documents superseded
This Standard is the first edition.
Relationship to other TIA standards and documents
•
ANSI/TIA/EIA-568-B.1, Commercial Building Telecommunications Cabling Standard; Part 1
General Requirements
•
ANSI/TIA/EIA-568-B.2, Commercial Building Telecommunications Cabling Standard; Part 2
Balanced Twisted-Pair Cabling Components
•
ANSI/TIA/EIA-568-B.3, Optical Fiber Cabling Components Standard
•
ANSI/TIA/EIA-569-A, Commercial Building Standard for Telecommunications Pathways and
Spaces
•
ANSI/TIA/EIA-570-A, Residential Telecommunications Cabling Standard
•
ANSI/TIA/EIA-606-A, Administration Standard for Commercial Telecommunications Infrastructure
•
ANSI/TIA/EIA-J-STD-607, Commercial Building Grounding (Earthing) and Bonding Requirements
for Telecommunications
•
ANSI/TIA/EIA-758, Customer-Owned Outside Plant Telecommunications Cabling Standard
This Standard contains references to national and international standards. Where appropriate,
international standards are used.
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The following documents may be useful to the reader:
a) National Electrical Safety Code (NESC)
(IEEE C 2)
b) Life Safety Codes (NEC)
(NFPA 101)
c) National Electrical Code (NEC)
(NFPA 70)
In Canada, the National Building Code, the National Fire Code, Canadian Electrical Code (CSA
C22.1), and other documents including CAN/ULC S524, CAN/ULC S531 may be used for crossreference to NFPA 72, NFPA 70 section 725-8 and section 725-54.
Useful supplements to this Standard are the Building Industry Consulting Service International
(BICSI) Telecommunications Distribution Methods Manual, the Customer-owned Outside Plant
Design Manual, and the Telecommunications Cabling Installation Manual. These manuals provide
recommended practices and methods by which many of the requirements of this Standard may be
implemented.
Other references are listed in annex F.
Annexes A, B and C are normative and considered a mandatory part of this Standard. Annexes D, E
and F are informative and not considered to be a requirement of this Standard.
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1
INTRODUCTION
1.1
Purpose
This Standard specifies a generic cabling system for building automation systems (BAS) used in
commercial buildings that will support a multi-product, multi-vendor environment. It also provides
information that may be used for the design of BAS products for commercial enterprises.
Building automation systems are typically used for controlling building systems such as fire alarm,
security and access control (e.g., closed circuit television, electronic door control), and energy
management systems (e.g., HVAC, lighting/power control). In addition, other “low voltage systems”
(e.g., audio/video paging, service/equipment alarms, non-voice/data communications) are also
included in the BAS systems that are supported by the telecommunications cabling infrastructure of a
building or campus.
The purpose of this Standard is to enable the planning and installation of a structured cabling system
for BAS applications used in new or renovated construction of commercial buildings.
This Standard establishes performance and technical criteria for various cabling system
configurations for accessing and connecting BAS equipment and devices. In order to determine the
requirements of a generic cabling system, performance requirements for various BAS services were
considered.
The diversity of services currently available, coupled with the continual addition of new services, may
result in cases where limitations to desired performance occur. When supporting specific applications
over these cabling systems, the user is cautioned to consult application standards, regulations,
equipment vendors, and system and service suppliers for applicability, limitations, and ancillary
requirements.
1.2
Specification of criteria
In accordance with EIA Engineering Publication, EP-7B, two categories of criteria are specified,
mandatory and advisory. Mandatory requirements are designated by the word “shall”; advisory
requirements are designated by the words “should”, “may” or “desirable” which are used
interchangeably in this Standard.
Mandatory criteria generally apply to protection, performance, administration and compatibility; they
specify the absolute minimum acceptable requirements. Advisory or desirable criteria are presented
when their attainment will enhance the general performance of the cabling system in all its
contemplated applications.
A note in the text, table, or figure is used for emphasis or for offering informative suggestions.
1.3
Metric equivalents of US customary units
All measurements provided in this document are given in the International System of Units (SI) to
harmonize with the International standards. The majority of the metric dimensions in this Standard are
soft conversions of US customary units: e.g., 100 millimeters is the soft conversion of 4 inches.
1.4
Life of this Standard
This Standard is a living document. The criteria contained in this Standard are subject to revisions
and updating as warranted by advances in building construction techniques and telecommunications
technology.
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ANSI/TIA/EIA-862
1.5
Telecommunications cabling system structure
Figure 1 illustrates a representative model for the various functional elements that comprise a BAS
cabling system for a commercial building. It depicts the relationship between the elements and how
they are configured to create the total system.
The basic elements of the BAS cabling system structure are the following.
a) horizontal cabling (clause 4)
b) backbone cabling (clause 5)
c) coverage area (clause 6)
d) telecommunications room or common telecommunications room (clause 7)
e) equipment room or common equipment room (clause 8)
f)
entrance facilities (clause 9)
g) administration
NOTE - Basic administration information is covered in various locations
throughout this Standard. Refer to ANSI/TIA/EIA-606-A for more information
regarding administration.
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Figure 1: Example of BAS Cabling Structure in a single-tenant building
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ANSI/TIA/EIA-862
2
SCOPE
2.1
General
This Standard specifies minimum requirements for building automation systems (BAS) cabling within
a commercial building and between buildings in a campus environment. It specifies cabling
requirements for cabling topology, architecture, design, and installation practices, test procedures and
requirements for components that comprise the cabling system. The BAS cabling for commercial
buildings specified by this Standard is intended to support a wide range of commercial building sites.
2
2
Typically, this range includes sites with a geographical extent from 100 m , up to 1 000 000 m of
office space, and with a population of up to 50 000 individual users. Life and Safety codes take
precedence over the requirements specified in this Standard.
This Standard applies to the BAS cabling systems of buildings for commercial enterprises.
2.2
Normative references
The following standards contain provisions that, through reference in this text, constitute provisions of
this Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision; parties to agreements based on this Standard are encouraged to investigate the possibility
of applying the most recent editions of the standards indicated. ANSI and TIA maintain registers of
currently valid national standards published by them.
a) ANSI/TIA/EIA-568-B.1-2001, Commercial Building Telecommunications Cabling Standard:
Part 1: General Requirements
b) ANSI/TIA/EIA-568-B.2-2001, Commercial Building Telecommunications Cabling Standard:
Part 2: Balanced Twisted-Pair Cabling Components
c) ANSI/TIA/EIA-568.B.3-2000, Optical Fiber Cabling Components Standard
d) ANSI/TIA/EIA-569-A-1998, Commercial Building Standard for Telecommunications Pathways
and Spaces
e) ANSI/TIA/EIA-606-A-2002, Administration Standard for Commercial Telecommunications
Infrastructure
f)
ANSI/TIA/EIA-J-STD-607-2001, Commercial Building Grounding (Earthing) and Bonding
Requirements for Telecommunications
g) ANSI/TIA/EIA-758-1999, Customer-Owned Outside Plant Telecommunications Cabling
Standard
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3
DEFINITIONS, ACRONYMS & ABBREVIATIONS
3.1
General
This clause contains the definitions of terms, acronyms, and abbreviations that have special meaning
or that are unique to the technical content of the standard. Special definitions that are appropriate to
individual technical clauses are included.
3.2
Definitions
The generic definitions in this clause have been formulated for use by the entire family of
telecommunications infrastructure standards. Specific requirements are found in the normative
clauses of this Standard. For the purposes of this Standard, the following definitions apply.
administration: The method for labeling, identification, documentation and usage needed to
implement moves, additions and changes of the telecommunications infrastructure.
backbone: A facility (e.g., pathway, cable or conductors) between any of the following spaces:
telecommunications rooms, common telecommunications rooms, floor serving terminals, entrance
facilities, equipment rooms, and common equipment rooms.
backbone cable: See backbone.
binder group: One of two or more bound collections of pairs or fibers within a cable.
bonding: The permanent joining of metallic parts to form an electrically conductive path that will
ensure electrical continuity and the capacity to conduct safely any current likely to be imposed.
bridged tap: A connection that enables multiple appearances of the same cable pair at several
distribution points.
building automation system: Equipment and telecommunications infrastructure that supports
monitoring, control, operation and management of building services.
building entrance area: See entrance room or space (telecommunications).
cable: An assembly of one or more insulated conductors or optical fibers, within an enveloping
sheath.
cable run: A length of installed media, which may include other components along its path.
cable sheath: A covering over the optical fiber or conductor assembly that may include one or more
metallic members, strength members, or jackets.
cabling: A combination of all cables, jumpers, cords, and connecting hardware.
campus: The buildings and grounds having legal contiguous interconnection.
channel: The end-to-end transmission path between two points at which application-specific
equipment is connected.
commercial building: A building or portion thereof that is intended for office use.
common equipment room (telecommunications): An enclosed space used for equipment and
backbone interconnections for more than one tenant in a building or campus.
common telecommunications room: An enclosed space used for backbone interconnections for
more than one tenant in a building, which may also house equipment.
connecting hardware: A device providing mechanical cable terminations.
consolidation point: A location for interconnection between horizontal cables extending from building
pathways and horizontal cables extending into furniture pathways.
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cord (telecommunications): A cable using stranded conductors for flexibility, as in distribution cords
or line cords.
coverage area: The area served by a device.
coverage area cable/cord: A cable or cord connecting the building automation system outlet or
horizontal connection point to a building automation system device.
cross-connect: A facility enabling the termination of cable elements and their interconnection or
cross-connection.
cross-connection: A connection scheme between cabling runs, subsystems, and equipment using
patch cords or jumpers that attach to connecting hardware on each cord end.
customer premises: Building(s), grounds and appurtenances (belongings) under the control of the
customer.
demarcation point: A point where the operational control or ownership changes.
entrance facility (telecommunications): An entrance to a building for both public and private network
service cables (including wireless) including the entrance point of the building and continuing to the
entrance room or space.
entrance point (telecommunications): The point of emergence for telecommunications cabling
through an exterior wall, a floor, or from a conduit.
entrance room or space (telecommunications): A space in which the joining of inter or intra building
telecommunications backbone facilities takes place.
equipment cable; cord: A cable or cable assembly used to connect telecommunications equipment to
horizontal or backbone cabling.
equipment room (telecommunications): An environmentally controlled centralized space for
telecommunications equipment that usually houses a main or intermediate cross-connect.
fiber optic: See optical fiber.
ground: A conducting connection, whether intentional or accidental, between an electrical circuit (e.g.,
telecommunications) or equipment and the earth, or to some conducting body that serves in place of
earth.
horizontal cabling: 1)The cabling between and including the telecommunications outlet/connector and
the horizontal cross-connect. 2) The cabling between and including the building automation system
outlet or the first mechanical termination of the horizontal connection point and the horizontal crossconnect.
horizontal connection point: A location for connections between horizontal cables that extend from
building pathways and horizontal cables that extend to building automation systems devices and
equipment.
horizontal cross-connect: A cross-connect of horizontal cabling to other cabling, e.g., horizontal,
backbone, and equipment.
infrastructure (telecommunications): A collection of those telecommunications components,
excluding equipment, that together provide the basic support for the distribution of all information within
a building or campus.
interconnection: A connection scheme that employs connecting hardware for the direct connection
of a cable to another cable without a patch cord or jumper.
intermediate cross-connect: A cross-connect between first level and second level backbone
cabling.
jumper: An assembly of twisted-pairs without connectors, used to join telecommunications circuits/links
at the cross-connect.
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link: A transmission path between two points, not including terminal equipment, work area cables, and
equipment cables.
main cross-connect: A cross-connect for first level backbone cables, entrance cables, and equipment
cables.
mechanical room: An enclosed space serving the needs of mechanical building systems.
media (telecommunications): Wire, cable, or conductors used for telecommunications.
mode: A path of light in an optical fiber.
multimode optical fiber: An optical fiber that carries many paths of light.
multipoint bus: An open sequence of connected devices.
multipoint ring: A closed sequence of connected devices.
open office: A floor space division provided by furniture, moveable partitions, or other means instead of
by building walls.
optical fiber cable: An assembly consisting of one or more optical fibers.
outlet/connector (telecommunications): A connecting device in the work area on which horizontal
cable or outlet cable terminates.
outlet/connector (building automation system): A connecting device between a horizontal cable
and coverage area cable.
patch cord: A length of cable with a plug on one or both ends.
pathway: A facility for the placement of telecommunications cable.
pigtail: One or more conductors or fibers with only one end terminated.
screen: An element of a cable formed by a shield.
sheath: See cable sheath.
shield: A metallic layer placed around a conductor or group of conductors.
singlemode optical fiber: An optical fiber that carries only one path of light.
space (telecommunications): An area used for housing the installation and termination of
telecommunications equipment and cable, e.g., common equipment rooms, equipment rooms, common
telecommunications rooms, telecommunications rooms, work areas, and maintenance holes/handholes.
splice: A joining of conductors, meant to be permanent.
splice closure: A device used to protect a splice.
star topology: A topology in which telecommunications cables are distributed from a central point.
telecommunications: Any transmission, emission, and reception of signs, signals, writings, images,
and sounds, that is, information of any nature by cable, radio, optical, or other electromagnetic systems.
telecommunications outlet: See outlet/connector (telecommunications).
telecommunications room: An enclosed architectural space for housing telecommunications
equipment, cable terminations, and cross-connect cabling.
telecommunications entrance facility: See entrance facility (telecommunications).
telecommunications entrance room or space: See entrance room or space
(telecommunications).
terminal: (1) A point at which information may enter or leave a communications network. (2) The
input-output associated equipment. (3) A device by means of which wires may be connected to each
other.
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ANSI/TIA/EIA-862
topology: The physical or logical arrangement of a telecommunications system.
work area (work station): A building space where the occupants interact with telecommunications
terminal equipment.
work area cable (cord): A cable connecting the telecommunications outlet/connector to the terminal
equipment.
zone box: An enclosure used to house one or more of the following; a) a consolidation point, b) a
horizontal connection point, c) building automation system outlets.
3.3
Acronyms and abbreviations
ac
alternating current
AHJ
authority having jurisdiction
ANSI
American National Standards Institute
AWG
American Wire Gauge
BAS
building automation system
CCTV
closed-circuit television
CER
common equipment room
CTR
common telecommunications room
dc
direct current
EF
entrance facility
EIA
Electronic Industries Alliance
EMS
energy management system
ER
equipment room
FLS
fire life safety
HC
horizontal cross-connect
HCP
horizontal connection point
HVAC
heating, ventilation, and air conditioning
IC
intermediate cross-connect
IEEE
The Institute of Electrical & Electronic Engineers
LAN
local area network
MC
main cross-connect
MR
mechanical room
NEC
National Electrical Code
TIA
Telecommunications Industry Association
TR
telecommunications room
TSB
Telecommunications System Bulletin
UL
Underwriters Laboratories Inc
UTP
unshielded twisted-pair
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ANSI/TIA/EIA–862
3.4
Units of measure
A
ampere
dB
decibel
ºC
degrees Celsius
Hz
hertz
kHz
kilohertz
m
meter
mA
milliamp
MHz
megahertz
mm
millimeter
µm
micrometer or micron
Ω
ohm
V
volt
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ANSI/TIA/EIA-862
4
HORIZONTAL CABLING
4.1
General
The horizontal cabling shall meet the performance requirements of ANSI/TIA/EIA-568-B.1.
Horizontal cabling is intended to:
a) integrate common services;
b) accommodate diverse BAS applications;
c) facilitate on-going maintenance and provide the capability for rapid deployment of BAS
services;
d) provide redundancy for safety and security requirements; and,
e) satisfy requirements for services and systems such as:
1. building control and monitoring device services (e.g., fire alarm safety system, security,
HVAC, etc.);
2. building automation data telecommunications (e.g., BAS telecommunications TIA/EIA485-A for primary and secondary bus telecommunications);
3. audio (digital/analog) telecommunications; and
4. closed-circuit television (CCTV).
5. other “low voltage systems” provided for building infrastructure (refer to annex D).
Elements of the horizontal cabling include the horizontal cross-connect (HC), horizontal cable,
horizontal connection point (HCP), and BAS outlet/connector.
The horizontal cabling links extend from the HC to the BAS outlet/connector or the HCP or both.
When a BAS outlet/connector is not used, an HCP should be provided between the HC and any BAS
device.
The horizontal cabling design should be formulated in the early phases of building design and
construction. It is critical that the layout and selection of horizontal cabling components is done with
the greatest design flexibility for the deployment of BAS services. Early planning and a structured
BAS horizontal cabling design will minimize disruptions to building occupants.
For planning purposes, a sufficient number of horizontal cabling links should be provided for building
automation services over the average floor space as described in 6.2. For example, in an office
2
space, a minimum of one horizontal cabling link should be provided per 25 m of floor space. Each
horizontal cable link may serve multiple coverage areas.
Application-specific components such as impedance terminating components shall be external to the
horizontal cabling. Splices (other than optical fiber splices), bridged taps, and multipoint connections
shall not be permitted as part of the horizontal cabling.
4.2
Topology
The horizontal cabling shall be a star topology (see figure 2). Coverage area cabling can be
configured using additional topologies depending on the application requirements (see 6.4 and annex
C).
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ANSI/TIA/EIA–862
Figure 2: Example of horizontal cabling using a star topology to coverage areas
4.2.1 Centralized BAS
It is possible to use the star topology to create a centralized BAS. This approach may have distance
limitations. A centralized BAS should be deployed in accordance with the manufacturer’s instructions.
Refer to figure 3 for an example of centralized BAS. Refer to ANSI/TIA/EIA-568-B.1 for distance
requirements associated with centralized optical fiber cabling.
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ANSI/TIA/EIA-862
Figure 3: Example of distributed versus centralized BAS
4.3
Horizontal connection point (HCP)
An HCP allows coverage area connections to be reconfigured. No more than one HCP shall be
placed in a single horizontal cabling link. Each cable extending from the HCP shall be terminated
directly to a BAS device or to a BAS outlet/connector.
When a BAS outlet/connector is used, the HCP is optional. In this case, from an architectural
perspective, the HCP is to BAS cabling, what the CP is to voice/data cabling.
When cross-connections are used at the HCP, a BAS outlet/connector shall not be installed as part of
the horizontal cabling link. This requirement ensures that the horizontal channel contains no more
than 4 connections.
The HCP should be readily accessible and its location visibly marked allowing for ease of routine
maintenance and reconfiguration. HCPs shall be located in fully accessible, permanent locations.
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ANSI/TIA/EIA–862
HCPs shall not be located in any obstructed area. HCPs shall be administered in the same manner
as telecommunications cabling, hardware, pathways and spaces as specified in ANSI/TIA/EIA-606-A.
NOTE - For copper cabling, it is recommended that the horizontal connection
point be located at least 15 m from the telecommunications room (to reduce
the effect of multiple connections in close proximity on NEXT loss). Refer to
4.7 for horizontal distance requirements.
The functions of a CP and an HCP can be combined within the same zone box. Refer to 6.6.1 for
information on zone boxes.
The number of links served by an HCP should be limited to 12. The HCP design will depend on the
number of coverage areas served. Refer to 6.2 for coverage area planning.
NOTE - Spare capacity for future expansion, should be considered when
determining the size of the HCP.
4.4
Building automation system outlet/connector
When used, a BAS outlet/connector shall be connected to the horizontal cable either directly or
through an HCP. All connections from a BAS outlet/connector to a BAS device shall be made using a
coverage area cable.
A single horizontal cabling link shall contain only one BAS outlet/connector, if used. A single BAS
outlet/connector may serve more than one coverage area depending on the coverage area topology
used. Refer to annex C for additional information on the coverage area topologies.
A BAS outlet/connector shall use an interface that complies with the horizontal cabling requirements
specified in ANSI/TIA/EIA-568-B.1.
4.5
Horizontal cross-connect
In addition to the horizontal cross-connect usage in a typical equipment room or telecommunications
room, the horizontal cross-connect provides a termination point for BAS horizontal cables before they
are terminated onto equipment located in the mechanical room (MR). Horizontal cabling extending
from the horizontal cross-connect should terminate directly onto a BAS outlet/connector or an HCP.
4.6
Recognized cabling components
The BAS horizontal cabling includes horizontal cables, BAS outlet/connector, and mechanical
terminations at the HC and HCP. Also included in the horizontal BAS cabling are patch cords or
jumpers located in the HCs and HCPs.
The recognized transmission media are listed below.
a) 100 ohm balanced twisted-pair cable (ANSI/TIA/EIA-568-B.2)
b) multimode optical fiber cable, either 62.5/125 or 50/125 µm (ANSI/TIA/EIA-568-B.3)
c) singlemode optical fiber cable (ANSI/TIA/EIA-568-B.3)
The associated connecting hardware, cross-connect jumpers, patch cords and equipment cords shall
comply with ANSI/TIA/EIA-568-B.2 or ANSI/TIA/EIA-568-B.3.
4.6.1 Conductor gauge size
22 or 24 AWG unshielded twisted-pair cable is recommended to support BAS applications. Refer to
annex A for guidance on current capacity.
NOTE - wire compatibility is an important consideration when connecting to
BAS devices equipped with pigtails.
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4.7
Horizontal distances
4.7.1 Distributed BAS horizontal cabling links
The maximum horizontal distance for distributed BAS links shall be 90 m, independent of the media
type (see figure 4 and figure 5).
Figure 4: Example of horizontal cabling link using an HCP
Figure 5: Example of horizontal cabling link using a BAS outlet/connector
4.7.2 BAS channels
A BAS channel is defined as the cabling between a controller in the TR or MR/ER and a BAS device
in the coverage area. It may include both backbone and horizontal cabling. Maximum allowed cable
length between the BAS equipment in the TR and any BAS device in the coverage area is application
dependent. If a BAS channel includes horizontal and backbone sub-systems, the backbone length
requirements shall comply with 5.4.1.
Cross-connect jumpers and patch cords in the cross-connect facilities, including horizontal crossconnects, jumpers, and patch cords that connect horizontal cabling with equipment or backbone
cabling, should not exceed a length of 5 m.
4.8
Cabling installation requirements
Cabling installation shall conform to ANSI/TIA/EIA-568-B.1.
4.8.1 Sharing pathways and spaces
The cabling specified in this Standard along with its associated equipment may, to the limits imposed
by the applications, share the same pathways and spaces of the cabling specified in ANSI/TIA/EIA568-B.1 and its associated equipment to the extent permitted by local codes and regulations, and the
authority having jurisdiction (AHJ).
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ANSI/TIA/EIA–862
The pathways and spaces should be based on ANSI/TIA/EIA-569-A. Because the scope of
ANSI/TIA/EIA-569-A does not cover BAS cabling, additional pathway capacity may be required for
BAS cables serving the coverage areas. Refer to annex B for additional information on separation of
services.
4.8.2 Multiple applications
A minimum of one dedicated horizontal cabling link shall be provided for each distinct building
automation service (e.g., fire alarm safety system, HVAC).
4.8.3 Sheath sharing
Some BAS applications may allow multiple channels within the same cable. Some information on
sheath sharing can be found in ANSI/TIA/EIA-568-B.1, annex B. Consult with the BAS equipment
manufacturer before implementing BAS applications sharing in the same cable.
NOTE - Sheath sharing may be restricted based on safety considerations.
Refer to local codes, regulations and the AHJ.
4.9
Grounding considerations
Grounding shall meet the requirements and practices of applicable authorities or codes. In addition,
the building telecommunications grounding/bonding system shall conform to ANSI/TIA/EIA-J-STD607 requirements.
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ANSI/TIA/EIA-862
5
BACKBONE CABLING
5.1
General
In the BAS cabling structure, backbone cabling provides interconnections between
telecommunications rooms (TR), common telecommunications rooms (CTR), equipment rooms (ER),
common equipment rooms (CER), terminal space and entrance facilities spanning campus buildings.
Backbone cabling consists of inter-building cables, backbone cables, intermediate and main crossconnects, mechanical terminations, and patch cords or jumpers used for backbone-to-backbone
cross-connection.
Backbone cabling is expected to satisfy the telecommunications and BAS requirements over
equipment life cycles spanning from 6-10 years. The length and frequency of service requirement
changes are based on the changing needs of the building.
An estimate of the maximum amount of backbone BAS cabling (copper and fiber) and hardware
required is based on:
a) BAS applications projected over the life expectancy of the cabling system
b) the maximum number of BAS devices and electronic control projected over the life expectancy of
the cabling system
Backbone cabling installed outdoors in a campus environment shall meet the requirements of
ANSI/TIA/EIA-758.
5.2
Topology
5.2.1 Star topology
The backbone cabling shall comply with a hierarchical star topology. An example of the basic
backbone cabling topology is shown in figure 1. The backbone star topology can be configured to
support star or non-star (bus or ring) coverage area configurations.
5.3
Recognized cables
The backbone cabling will support a wide range of services and site sizes. This Standard specifies
transmission media, which shall be used individually or in combination with the backbone cabling.
The recognized transmission media are listed below.
a) 100 ohm twisted-pair cable (ANSI/TIA/EIA-568-B.2)
b) multimode optical fiber cable, either 62.5/125 µm or 50/125 µm (ANSI/TIA/EIA-568-B.3)
c) singlemode optical fiber cable (ANSI/TIA/EIA-568-B.3)
The associated connecting hardware, cross-connect jumpers, patch cords and equipment cords shall
comply with ANSI/TIA/EIA-568-B.2 or ANSI/TIA/EIA-568-B.3.
5.3.1 Choosing media
Factors to consider when choosing a media are:
a) Flexibility and support of a wide range of services;
b) Future service requirements;
c) Site size and user population.
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ANSI/TIA/EIA–862
5.4
Backbone cabling distances
5.4.1 Intra and inter-building distances
When applicable, the maximum intra and inter-backbone distances for BAS applications should
comply with 5.5.1 of ANSI/TIA/EIA-568-B.1.
5.4.2 Cabling directly between TRs or CTRs
If requirements for “bus” or “ring” configurations are anticipated, then cabling directly between
telecommunications rooms or common telecommunications rooms or both are allowed. Such cabling
is in addition to the connections for the star topology specified ANSI/TIA/EIA-568-B.1.
5.5
Cabling installation requirements
Backbone cabling installation shall conform to ANSI/TIA/EIA-568-B.1.
5.5.1 Sharing pathways and spaces
The pathways and spaces should be based on ANSI/TIA/EIA-569-A. Because the scope of
ANSI/TIA/EIA-569-A does not allocate capacity for BAS cabling, additional pathway capacity may be
required. Refer to annex B for additional information on separation of services.
5.5.2 Multiple applications
A minimum of one binder group or dedicated backbone cable shall be provided for each distinct
building automation service (e.g., fire alarm safety system, HVAC).
5.5.3 Sheath sharing
Some BAS applications may allow multiple channels within the same cable or binder group. Some
information on sheath sharing can be found in ANSI/TIA/EIA-568-B.1. Consult with the BAS
equipment manufacturer before implementing BAS applications when using cable sharing.
NOTE - Sheath sharing may be restricted based on safety considerations.
Refer to local codes, regulations and the AHJ.
5.5.4 Grounding considerations
Grounding shall meet the requirements and practices of applicable authorities or codes. In addition,
the telecommunications grounding/bonding system shall conform to ANSI/TIA/EIA-J-STD-607
requirements.
5.6
Redundancy
Additional redundant pathway designs are recommended to support multiple routes for backbone
cabling. Telecommunications room and common telecommunications room designs should include
and allow for additional redundant backbone cables to be installed from different directions using
different pathways.
NOTE - Safety and security issues may mandate backbone cabling
redundancy for specific building automation systems.
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6
COVERAGE AREA
6.1
General
The coverage area refers to the space served by one BAS device. A single horizontal cabling link or
channel may serve more than one coverage area.
6.2
Coverage area planning
Each BAS application required for the commercial building project (e.g., HVAC application controller
for temperature sensors) should be considered in determining the density of coverage areas and
devices. Depending on their applications or function, BAS devices may have overlapping coverage
areas. For example, multiple BAS devices may serve the same building space.
A floor space with adjacent coverage areas in an open office environment may be served with a zone
box used for both BAS connections to an HCP, and voice/data connections to a CP. Spare growth
capacity should also be considered when designing the cabling infrastructure. Refer to 4.7 for
distance requirements.
If the quantity of BAS coverage areas is unknown, use table 1 to estimate the quantity of BAS
horizontal cabling links required to serve that space.
Coverage areas may be served by:
a) centralized equipment located in a CTR, ER, CER or MR, typically through the backbone cabling
b) distributed equipment located in a TR
c) local equipment located in the coverage area
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ANSI/TIA/EIA–862
Table 1: Typical coverage area for each BAS link
Usage of floor
space
Additional considerations
Coverage
2
area (m )
In an open office environment, coverage area sizes will typically be
greater than in a dedicated office space.
Office
25
Indoor Parking
50
Retail
25
Security requirements may increase the coverage area density
(e.g., CCTV, alarm, access)
Factory
50
Coverage area size may vary according to manufacturing
processes, environment and building design.
Hotel
25
Coverage area requirements may vary if BAS services have
centralized control (e.g., HVAC, fire alarm safety system, access).
Classroom
25
Coverage area requirements may be centralized for security and
access controls. Plan for the unique BAS requirements for each
area type (e.g., fire alarm safety system, access control, HVAC).
Hospital
25
Coverage area density is averaged to compensate for a variety of
environments (e.g., patient rooms, labs, emergency room and
operating room) - Plan for the unique BAS requirements for each
area type.
Mechanical Room
5
Determine location of air handlers, chillers, boilers, pumps, fans,
compressors, etc. Air handlers will typically have a higher
concentration of BAS devices.
Identify fire, security, carbon monoxide and HVAC requirements
NOTE - May also require voice connections for security.
NOTE - Coverage area size depends on the BAS application and device. These coverage areas are
based on average values from a study of FLS, security and HVAC/EMS applications.
6.3
Coverage area cables
The coverage area cable begins at the cable termination from the first BAS device to either a building
automation system outlet/connector or directly to a horizontal connection point.
Cables that extend to and from BAS devices shall meet the same requirements as the horizontal
cables to which they connect, and shall comply with ANSI/TIA/EIA-568-B.2 or ANSI/TIA/EIA-568-B.3.
6.3.1 Connections to a BAS outlet/connector or HCP
The maximum length of the coverage area cable is determined by the application, the topology used
and the number of devices served by the same horizontal link. For some applications it may be
necessary to limit the length of coverage area cable to 5 m.
6.3.2 Connections to and from BAS devices
For connections to BAS devices, it is important to make sure that the coverage area cable is
compatible with the BAS device termination (e.g., screw terminal, pigtail, connector type, wire gauge,
fiber size)
NOTE - Special connectors may be required to connect coverage area
cables to BAS devices.
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6.4
Coverage area topologies
Although it is recommended that horizontal cabling be configured in a star topology, the function of
the coverage area topologies is to provide deviations that will support different BAS applications with
respect to a structured cabling system approach. Bus or ring topologies should be implemented by
connections at the HC or at the HCP. Alternately, coverage area devices can be connected in a bus
or ring topology using multipoint connections. These additional topologies shall be implemented using
the coverage area cable.
NOTE - The BAS devices may be connected to the HCP via a BAS controller
in the coverage area.
The coverage area topologies are:
a) Physical device connections using a star topology
1) star
2) bridge connection
3) chain connection
b) Physical device connections using multipoint bus and ring
1) multipoint bus
2) multipoint ring/fault tolerant circuit
6.4.1 Physical device connections using a star topology
6.4.1.1 Star
The basic star for a BAS is similar to the telecommunications star configuration as specified in
ANSI/TIA/EIA-568-B.1. There is one coverage area cable connected to the end of each horizontal
cabling link. Refer to figure 6 for an example of a star topology.
Figure 6: Example of a star topology
6.4.1.2 Bridge connection
If required, bridge connections should be provided at the HCP or at the HC. No more than 10
coverage area cables shall be connected to the same bridge. Bridged connections shall not be
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ANSI/TIA/EIA–862
cascaded (i.e., shall not exist at more than one location on the same channel). Refer to figure 7 for an
example of bridge connection topology.
Figure 7: Example of bridge connection
6.4.1.3 Chain connection
When this implementation is used, an input connection and a return connection are provided to each
BAS device. The chain is formed by connecting the return connection of one BAS device to the input
connection of another BAS device at the HC or HCP. No more than 10 branches should be
connected in a chain configuration. Refer to figure 8 for an example of chain connection topology.
When a chain connection topology is implemented, the use of bridge connections shall not be used.
Figure 8: Example of chain connection using two pairs per coverage area cable
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6.4.1.4 Multipoint bus and multipoint ring
Refer to annex C for additional information on multipoint bus and multipoint ring coverage area
topologies.
6.5
Administration
The administration of the BAS cabling infrastructure shall comply with the specifications provided by
ANSI/TIA/EIA-606-A.
6.6
Cabling installation requirements
Coverage area cabling installation shall conform to the horizontal cabling installation specified in
ANSI/TIA/EIA-568-B.1.
6.6.1 Coverage area flexibility
Commercial building cabling designs have introduced flexible layouts intended to support a wide
variety of spaces. Occupant spaces are frequently rearranged to meet changing requirements of
concentrated individual work group and collaborative work group systems. Flexibility is also an
important consideration for introducing new BAS technology to the commercial space after
completion of the building project. Many coverage area situations also require reconfiguration of
certain BAS controllers and associated devices.
A single zone box can serve both BAS and voice/data cabling but separate zone boxes may be
desired for the following considerations:
a) Accessibility;
b) Security;
c) Administration;
d) Special applications.
Zone box capacity is determined by:
a) number of work area and quantity of outlet/connectors served by the CP;
b) number of links to BAS devices served by the HCP;
c) connection scheme used at the HCP (e.g., interconnections, cross-connections).
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7
TELECOMMUNICATIONS ROOMS
7.1
General
Telecommunications rooms provide many different functions for the cabling system. The following
sub-clauses describe the telecommunications room from a cabling perspective. These areas should
be used to optimize the installation and administration of the cabling equipment subsystem for the
BAS controller. The telecommunications room should serve coverage areas for the same floor in
which the telecommunications room resides.
7.2
Integration with voice/data/video systems
To facilitate integration of applications and services, the BAS controller cabinets should be located in
TR, CTR, ER, CER or MR.
NOTE - The selection of the BAS controller location is critical to the design of
the overall BAS device configuration.
7.3
Design
The telecommunications room should be designed and provisioned in accordance with the
requirements of ANSI/TIA/EIA-569-A. Because the scope of ANSI/TIA/EIA-569-A does not cover BAS
cabling, additional pathway and space capacity may be required. Refer to annex B for additional
information on separation of services.
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8
EQUIPMENT ROOMS
8.1
General
Equipment rooms are considered to be distinct from telecommunications rooms because of the
nature or complexity of the equipment they contain. For BAS, these spaces are commonly known as
mechanical rooms. An equipment room may alternately provide any or all of the functions of a
telecommunications room.
The equipment rooms are the recommended areas to install the main BAS controllers. These areas
should be used to optimize the installation and administration of the cabling equipment subsystem for
the BAS controller.
8.2
Design
The equipment room should be designed and provisioned in accordance with the requirements of
ANSI/TIA/EIA-569-A. Because the scope of ANSI/TIA/EIA-569-A does not cover BAS cabling,
additional pathway and space capacity may be required. Refer to annex B for additional information
on separation of services.
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9
ENTRANCE FACILITIES
9.1
General
The entrance facility consists of the cables, connecting hardware, protection devices, and other
equipment needed to connect the outside plant facilities to the premises cabling. These components
may be used for public network services, private network customer premises services, or both. The
demarcation point between the access providers and the customer premises cabling may be part of
the entrance facility.
9.2
Design
The entrance facility should be designed and provisioned in accordance with the requirements of
ANSI/TIA/EIA-569-A. Because the scope of ANSI/TIA/EIA-569-A does not cover BAS cabling,
additional pathway and spaces capacity may be required. Refer to annex B for additional information
on separation of services.
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ANSI/TIA/EIA-862
10
TRANSMISSION AND FIELD TEST REQUIREMENTS
10.1
General
Horizontal cabling link performance verification should be performed using permanent link
requirements between the HC and BAS outlet/connector or between the HC and HCP. When
permanent links are tested, the test shall be performed without bridge or bus connections.
For information regarding transmission and field test requirements, refer to ANSI/TIA/EIA-568-B.1.
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Annex A (NORMATIVE) Power feeding BAS devices over twistedpair cabling
This annex is normative and is considered a part of this Standard.
A.1
General
This annex provides guidelines on current capacity.
NOTE - For safety considerations refer to local codes, regulations and the AHJ.
A.2
Current capacity
Current on individual conductors shall be limited to values that do not cause an excessive
temperature rise with due regard to insulation materials and ambient temperatures. Installed cabling
shall not be subject to combinations of operating currents and temperatures in excess of those
specified in table A-1.
NOTE – The dc resistance unbalance is controlled by component requirements.
Table A-1: Maximum operating currents and temperatures for 24 AWG and 22 AWG cabling
channels
Wire gauge
(min diameter)
Max operating
temperature
Maximum current for
a single conductor
Total maximum
current for a
4-pair cable
24 AWG (0,5 mm)
25°C
1.50 A
3.36 A
0.75 A
1.68 A
24 AWG (0,5 mm)
22 AWG (0,64 mm)
22 AWG (0,64 mm)
55°C
NOTE 2
25°C
55°C
NOTE 1
6.00 A
NOTE 1
3.00 A
1.50 A
NOTE 2
0.75 A
NOTE 1
NOTE 1
NOTE 1- These values are limited by the maximum operating current of connecting
hardware, such as the 8-pin modular outlet/connector. The cable limits all other
maximum currents listed.
NOTE 2 -For BAS applications, when the maximum operating temperature is between 55°C
and 60°C, a minimum 75°C temperature rated cable is required.
These requirements are based on the most limiting component in the channel. For both connecting
hardware and cable, a current capacity reduction will apply for operating environments above 55°C.
Connecting hardware shall support a maximum current of 0.75 A at 60°C per conductor in
accordance with IEC 60603-7.
It is assumed that a single conductor in a horizontal cable (4-pair 24 AWG) can support a minimum
current of 1.5 A at 25°C and 0.75 A at 55°C. It is also assumed that a horizontal cable (4-pair 24
AWG) can support a total current of 3.36 A at 25°C and 1.68A at 55°C over any combination of
conductors, provided that the single conductor limit is not exceeded.
For horizontal cables having 22 AWG conductors, it is assumed that a single conductor can support a
minimum current of 2.4 A at 25°C and 1.2 A at 55°C. It is also assumed that a horizontal cable with
22 AWG conductors can support a total current of 8 A at 25°C and 4 A at 55°C over any combination
of conductors, provided that the single conductor limit is not exceeded.
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ANSI/TIA/EIA-862
NOTE - For cable subject to maximum operating temperature of 55°C, it is
assumed that the maximum temperature rise does not exceed 5°C resulting
in a maximum cable temperature of 60°C.
A.3
Resistance and resistance unbalance
Installed horizontal cabling shall not exceed a total dc loop resistance of 21 ohms for any operating
temperature when measured from the HC to the HCP, or from the HC to the BAS outlet/connector
(permanent link). Horizontal cabling channels up to 100 m shall not exceed a total loop resistance of
25 ohms at any operating temperature.
Installed horizontal cabling shall not exceed a total dc resistance unbalance of 0.80 ohm for any
operating temperature when measured from the HC to the HCP or the BAS outlet/connector
(permanent link). Horizontal cabling channels of 100 m shall not exceed a total resistance unbalance
of 1 ohm at any operating temperature.
A.4
Operating voltage
Installed cabling used for BAS applications in dry conditions shall not be subject to operating voltages
in excess of 60 V dc continuous, 30 V ac sinusoidal, 42.4 V ac peak non-sinusoidal or 24.8 V dc peak
where the latter dc current is interrupted at a rate of between 10 Hz and 200 Hz. Refer to table A-2 for
a summary of permitted voltages in dry conditions with inherently limited power sources.
Table A-2: Maximum operating voltages for installed BAS cables in dry conditions
Alternating Current
Maximum
permitted ac
voltage RMS
(Sinusoidal)
Maximum circuit
NOTE 1
power 100 VA
30
Direct Current
Maximum
permitted ac
voltage –
Maximum
permitted dc
voltage
Maximum
permitted dc
voltage-peak
peak-to-peak
(Continuous)
(Interrupted at
10 Hz to 200 Hz)
60
24.8
(Non-sinusoidal)
42.2
NOTE 1 - Maximum current shall not exceed the values in table A-1
Installed cabling used for BAS applications encountering wet, but not immersed conditions shall not
be subject to operating voltages in excess of 30 V dc continuous, 15 V ac sinusoidal, 21.2 V peak ac
non-sinusoidal or 12.4 V peak dc where the latter dc current is interrupted at a rate of between 10 Hz
and 200 Hz.
Refer to table A-3 for a summary of permitted voltages in wet conditions with an inherently limited
power source.
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ANSI/TIA/EIA–862
Table A-3: Maximum operating voltages for installed BAS cables in wet conditions
Alternating Current
Maximum
permitted ac
voltage RMS
(Sinusoidal)
Maximum circuit
NOTE 1
power 100 VA
15
NOTE 2
Direct Current
Maximum
permitted ac
voltage –
Maximum
permitted dc
voltage
Maximum
permitted dc
voltage-peak
peak-to-peak
(Continuous)
(Interrupted at
10 Hz to 200 Hz)
30
12.4
(Non-sinusoidal)
21.2
NOTE 1 - Maximum current shall not exceed 5 A
NOTE 2 - Wet condition not including immersion
A.5
Power dissipation (load)
Installed cabling used for BAS applications shall not be used to supply continuous power in excess of
100 VA. A BAS circuit exhibiting a maximum potential, under loaded or unloaded conditions, of 20 V
or less shall not be used to carry a continuous current in excess of 5 A. A BAS circuit exhibiting a
maximum potential, under loaded or unloaded conditions, of greater than 30 V ac (sinusoidal) or 60 V
dc (continuous) and not greater than 150V shall not be used to carry a continuous current in excess
of 5 mA.
NOTE - Loads in excess of 15 Watts per two pairs and those that are not
purely resistive (e.g., inductive) may cause damage to connecting hardware
contact surfaces when mated or unmated under load.
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ANSI/TIA/EIA-862
Annex B (NORMATIVE) Separation of services
This annex is normative and is considered a part of this Standard.
B.1
General
Cabling with conductive media intended for use in BAS applications shall be installed in such a
manner as to maintain a separation from other electrical cabling and services and shall comply with
the latest applicable local and national code requirements and the AHJ. These life and safety codes
take precedence over the requirements specified in this Standard. The specific provisions of NFPA 70
National Electrical Code (1999) in the United States that are applicable to BAS cabling are given
below. Note that these provisions are not all inclusive and that the reader is cautioned to consult with
the latest changes and provisions of the codes that apply for the area under jurisdiction.
B.2
Life safety considerations
For life safety considerations, refer to the NFPA 70 section 725-8. This section discusses safetycontrol equipment, Class 1 classification and physical protection requirements.
B.3
Electrical safety considerations
For electrical safety considerations, refer to the NFPA 70 section 725-54. This section discusses
installation of conductors and equipment. It provides information in regards to the installation of
conductors in parallel with electrical cabling requirements, pathways sharing considerations, different
circuits within the same cable requirements.
B.4
Separation distances
Guidelines for separation distances are available in ANSI/TIA/EIA-569-A and IEEE publication 5181982.
30
ANSI/TIA/EIA–862
Annex C (NORMATIVE) Optional coverage area topologies
This annex is normative and is considered a part of this Standard.
C.1
General
In addition to a star topology, coverage area cabling can be configured using specific coverage area
topologies.
C.2
Multipoint bus and ring
The bus configuration is a multipoint interconnection of devices. As implemented within the guidelines
of this Standard, multiple devices and/or pieces of BAS equipment may be attached to the same
horizontal cabling link. The bus may be terminated with an end-of-line-device (e.g., resistor). When
the coverage area cable is connected to one BAS device, the bus may be implemented with the star
topology. Refer to 6.4.
The ring configuration is a point-to-point circular configuration. As implemented within the guidelines
of this Standard, multiple devices and/or pieces of BAS equipment may be attached to each other in
series to create an unbroken circular path for transmission. The multipoint ring is sometimes referred
to as a fault-tolerant circuit.
C.2.1 Multipoint bus
When used, the multipoint bus connection allows multiple BAS devices to be connected to the same
horizontal cabling link. A multipoint bus connection may have bridge connections (refer to 6.4.1.2), if
the application permits. The number of BAS devices in a multipoint bus is application dependent.
Refer to figures C-1, C-2 and C-3 for examples of multipoint bus topology.
Figure C-1: Example of a multipoint bus
31
ANSI/TIA/EIA-862
Figure C-2: Example of a multipoint bus with optional bridge connections
Figure C-3: Example of multipoint bus with optional BAS outlet/connector
C.2.2 Multipoint ring
When used, a multipoint ring connects to two physically separate horizontal cabling links to one or
more BAS devices via coverage area cables. The horizontal cabling links used in a multipoint ring
should use separate pathways. Multipoint ring topology is typically used for fault-tolerant circuits.
Refer to figure C-4 for an example of multipoint ring topology.
The multipoint ring provides physical redundancy and is intended for equipment that can detect and
operate with single fault. Refer to 4.7 for distance limitations.
Figure C-4: Example of a multipoint ring
32
ANSI/TIA/EIA–862
Annex D (INFORMATIVE) Examples of low voltage BAS
This annex is informative only and is not part of this Standard.
D.1
General
This annex provides examples of building control systems that can be supported by the structured
cabling system in this Standard.
D.2
Examples of BAS
The following list of building automation systems is provided as examples for information only and is
not intended to be complete.
a) Telemetry
b) Patient monitoring
c) CATV/MATV
d) Overhead paging
e) CCTV (security video)
f)
Access control (door security)
g) Lighting/power control
h) Time & attendance (“time cards”)
i)
EdTV (Educational TV)
j)
Structured cabling system
k) Nurse call
l)
Infant security
m) HVAC control
n) Power monitoring & control
o) Data network
p) Fire alarm safety system
q) Medical gas alarms safety system
r)
Staff emergency alarms
s) Intercom
t)
Master synchronous clock.
33
ANSI/TIA/EIA-862
Annex E (INFORMATIVE) Balanced multipoint data bus
This annex is informative only and is not part of this Standard.
E.1
General
The guidelines provided in this annex are for information only and are not intended to replace the
existing standard documents, ANSI/TIA/EIA-485-A-98, "Electrical Characteristics of Generators and
Receivers for Use in Balanced Digital Multipoint Systems" and TIA/EIA-TSB89, "Application
Guidelines for TIA/EIA-485-A". For additional information, refer to the existing standard ANSI/TIA/EIA485-A-98 and TIA/EIA-TSB89. These existing documents provide requirements and guidelines for
applying circuits to form a balanced multipoint data bus that will comply with TIA/EIA-485-A.
A TIA/EIA-485 bus consists of multiple communication controllers that are usually connected together
via shielded twisted-pair cabling, but can also be used over unshielded twisted pair cabling (see table
E-1). There may be one or more signal pairs in the cable each having multiple drivers, receivers, or
transceivers depending upon the application requirements. The number of drivers and receivers, the
operating speed of the system, the method of interconnecting the equipment and the system margin,
determine the configuration of the system.
TIA/EIA-485 is referenced by numerous higher-level industry standards such as, but not limited to:
•
Intelligent Peripheral Interface (IPI)
•
Small Computer System Interface (SCSI)
•
Profibus, Process Field Bus
•
Interface and control for serial transmission for measurement data, start-stop-operation, 4-wire
bus (DIN-Bus)
•
Microcontroller System Serial Control Bus (BitBus)
•
Low-speed controller area network (CAN)
•
Vehicle area network (VAN)
E.2
Data rate
The circuits whose characteristics are specified in ANSI/TIA/EIA-485-A-98 are used in data, timing or
control systems where the data signaling rate is up to 10 Mb/s.
E.3
Topology
The topology is application dependent. Typically, the topology used to support this system is the
chain connection topology (refer to 6.4.1.3 of this Standard). An example of this topology is shown in
figure E-1. This example has been extracted from TIA/EIA-TSB89, "Application Guidelines for
TIA/EIA-485-A", where other examples are presented (refer to 3.4 of TIA/EIA-TSB89).
34
ANSI/TIA/EIA–862
Figure E-1: Example of ANSI/TIA/EIA-485 system configuration
E.4
Media selection
Determination of the proper cabling system capacitance and capacitance unbalance should be made
in conjunction with the characteristics of the drivers to be connected to and the length of the bus. The
100 ohm balanced twisted-pair cable that is specified in this Standard meets or exceeds the
construction and requirements of the cable type A and type C found in TIA/IEA-TSB89.
E.5
Horizontal distances
The fundamental limitation to the distance that a TIA/EIA-485 signal can be transmitted is based on
the voltage drop that is derived from the dc resistance in the conductors (refer to 4.1.2 of TIA/EIATSB89 for the equivalence circuit and voltage drop calculation). The proposed maximum
recommended length of a segment is 1200 m. The use of greater distances should comply with the
electrical specifications of ANSI/TIA/EIA-485-A-98.
E.6
Termination
The purpose of the termination is to maximize ac signal power transfer from the cabling. Since this is
an “ac” phenomenon, the termination should be selected for the application bandwidth and its
impedance value should be matched to the differential-mode characteristic impedance of the
balanced cabling system. The electrical parameters specified in ANSI/TIA/EIA-485-A-98 are selected
so that a generator can drive a total load having the value of 32 unit loads and an effective total
termination resistance as low as 60 ohms while providing a minimum differential voltage of 1.5 V.
Figure E-1 is showing the location of the terminations in a TIA/EIA-485 system configuration.
E.7
Node count
The maximum number of nodes per segment should be 32. With the use of repeater, the node count
can be expanded to 255 nodes.
35
ANSI/TIA/EIA-862
Annex F (INFORMATIVE) Bibliography and references
This annex is informative only and is not part of this Standard.
This annex contains information on the documents that are related to or have been referenced in this
document. Many of the documents are in print and are distributed and maintained by national or
international standards organizations. These documents can be obtained through contact with the
associated standards body or designated representatives. The applicable electrical code in the United
States is the National Electrical Code.
•
ANSI/ICEA S-80-576-1994, Communications Wire and Cable for Wiring Premises
•
ANSI/ICEA S-83-596-1994, Fiber Optic Premises Distribution Cable
•
ANSI/ICEA S-87-640-1992, Fiber Optic Outside Plant Communications Cable
•
ANSI/IEEE C2-1997, National Electrical Safety Code
•
ANSI/NFPA 70-1999, National Electrical Code
•
ANSI/TIA/EIA-568-B.1-2001, Commercial Building Telecommunications Cabling Standard
•
ANSI/TIA/EIA-568-B.2-2001, Commercial Building Telecommunications Cabling Standard: Part 2:
Balanced Twisted-Pair Cabling Components
•
ANSI/TIA/EIA-568-B.3-2000, Optical Fiber Cabling Components Standard
•
ANSI/TIA/EIA-569-A-1998, Commercial Building Standard for Telecommunications Pathways and
Spaces
•
ANSI/TIA/EIA-606-A-2002, Administration Standard for the Telecommunications Infrastructure of
Commercial Buildings
•
ANSI/TIA/EIA-J-STD-607-2001, Commercial Building Grounding (Earthing) and Bonding
Requirements for Telecommunications
•
ANSI/TIA/EIA-758-1999, Customer-owned Outside Plant Telecommunications Cabling Standard
•
ASTM B539-90, Measuring Contact Resistance of Electrical Connections (Static Contacts)
•
BICSI Telecommunications Distribution Methods Manual
•
BICSI Cabling Installation Manual
•
BICSI Customer-owned Outside Plant Methods Manual
•
BOMA - Building Owners Management Association, International – Codes & Issues, July 2000
•
CABA - Continental Automated Buildings Association,
•
Federal Communications Commission (FCC) Washington D.C., "The Code of Federal
Regulations, FCC 47 CFR 68"
•
FIPS PUB 174, Commercial Building Telecommunications Wiring Standard
•
IEEE 802.3-1990 (also known as ANSI/IEEE Std 802.3-1990 or ISO 8802-3: 1990 (E), Carrier
Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer
Specifications
•
IEEE 802.4-1990, Standard for Local Area Network Token Passing Bus Access Method, Physical
Layer Specification
•
IEEE 802.5-1998, Token Ring Access Method and Physical Layer Specifications
36
ANSI/TIA/EIA–862
•
IEEE 802.7-1989 (R1997) IEEE Recommended Practices for Broadband Local Area Networks
(ANSI)
•
IEEE Standard 518-1982, Guide for the installation of electrical equipment to minimize electrical
noise to controllers of external sources
•
IFMA - International Facility Management Association - Ergonomics for Facility Managers, June
2000
•
NFPA 72,National Fire Alarm Code, 1999
•
NEC, National Electrical Code, article 725, Class 1, Class 2 and Class 3 Remote-Control,
Signaling and Power-Limited Circuits.
•
NEC, National Electrical Code, article 760, Fire Alarm System.
•
Society of Cable Television Engineers, Inc., Document #IPS-SP-001, Flexible RF Coaxial Drop
cable Specification
•
TIA/EIA TSB-31-B, FCC 47 CFR 68, Rationale and Measurement Guidelines
•
ANSI/TIA/EIA-485-A-1998, Electrical Characteristics of Generators and Receivers for Use in
Balanced Digital Multipoint Systems
•
TIA/EIA-TSB89-1998, Application Guidelines for TIA/EIA-485-A
•
UL 444/CSA-C22.2 No. 214-94, Communications Cables
37
ANSI/TIA/EIA-862
The organizations listed below can be contacted to obtain reference information.
ANSI
American National Standards Institute (ANSI)
11 W 42 St.
New York, NY 10032
USA
(212) 642-4900
www.ansi.org
ASTM
American Society for Testing and Materials (ASTM)
100 Barr Harbor Drive
West Conshohocken, PA 19428-2959
USA
(610) 832-9500
www.astm.org
BICSI
Building Industry Consulting Service International (BICSI)
8610 Hidden River Parkway
Tampa, FL 33637-1000
USA
(800) 242-7405
www.bicsi.org
CSA
Canadian Standards Association International (CSA)
178 Rexdale Blvd.
Etobicoke, (Toronto), Ontario
Canada M9W 1R3
(416) 747-4000
www.csa-international.org
EIA
Electronic Industries Alliance (EIA)
2500 Wilson Blvd., Suite 400
Arlington, VA 22201-3836
38
ANSI/TIA/EIA–862
USA
(703) 907-7500
www.eia.org
FCC
Federal Communications Commission (FCC)
Washington, DC 20554
USA
(301) 725-1585
www.fcc.org
Federal and Military Specifications
National Communications System (NCS)
Technology and Standards Division
701 South Court House Road Arlington, VA 22204-2198
USA
(703) 607-6200
www.ncs.gov
ICEA
Insulated Cable Engineers Association, Inc. (ICEA)
PO Box 440
South Yarmouth, MA 02664
USA
(508) 394-4424
www.icea.net
IEC
International Electrotechnical Commission (IEC)
Sales Department
PO Box 131
3 rue de Varembe
1211 Geneva 20
Switzerland
+41 22 919 02 11
www.iec.ch
39
ANSI/TIA/EIA-862
IEEE
The Institute of Electrical and Electronic Engineers, Inc (IEEE)
IEEE Service Center
445 Hoes Ln., PO Box 1331
Piscataway, NJ 08855-1331
USA
(732) 981-0060
www.ieee.org
IPC
The Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Rd.
Northbrook, IL 60062-6135
USA
(847) 509-9700
www.ipc.org
ISO
International Organization for Standardization (ISO)
1, Rue de Varembe
Case Postale 56
CH-1211 Geneva 20
Switzerland
+41 22 74 901 11
www.iso.ch
NEMA
National Electrical Manufacturers Association (NEMA)
1300 N. 17th Street, Suite 1847
Rosslyn, VA 22209
USA
(703) 841-3200
www.nema.org
NFPA
National Fire Protection Association (NFPA)
Batterymarch Park
40
ANSI/TIA/EIA–862
Quincy, MA 02269-9101
USA
(617) 770-3000
www.nfpa.org
SCTE
Society of Cable Telecommunications Engineers (SCTE)
140 Philips Rd.
Exton, PA 19341-1318
USA
(800) 542-5040
www.scte.org
Telcordia Technologies (formerly; Bellcore)
Telcordia Technologies Customer Service
8 Corporate Place Room 3C-183
Piscataway, NJ 08854-4157
USA
(800) 521-2673
www.telcordia.com
TIA
Telecommunications Industry Association (TIA)
2500 Wilson Blvd., Suite 300
Arlington, VA 22201-3836
USA
(703) 907-7700
www.tiaonline.org
UL
Underwriters Laboratories, Inc. (UL)
333 Pfingsten Road
Northbrook, IL 60062-2096
USA
(847) 272-8800
www.ul.com
41